Intermittent spray device



12, 1929- 1. w. P. BUCHANAN INTERMITTENT SPRAY DEVICE Filed April 8, 1927 Euchanow ATTO R N EY Patented Nov. 12, 1929 warren s mane INTERMITTENT srnnv' n'nvrcn Application filed April 8,

This invention relates to improvements in spray devices of the intermittent type, the general object of the invention being to provide means for concentrating or confining the air blast about the discharge end of the liquid tube so as to increase atomization of the liquid without increasing the pumping efiort.

Another object of the invention is to pro-- vide means for preventing the suction created by the return stroke of the piston of the pump from drawing liquid through the liquid tube into the pump.

This invention also consists in certain I other features of constructionand in the combination and arrangement of the several parts, to be hereinafter fully described, illustrated in the accompanying drawings and specifically pointed out in the appended claims.

In describing my invention in detail, reference will be had to the accompanying drawings wherein like characters denote like or corresponding parts throughout the several views, and in which 5 Figure 1 is a top plan view of the device.

Figure 2 is an elevation thereof.

Figure 8 is a sectional View through a portion of the pump cylinder, its discharge tube and the container cap.

Figure 4 is an end View of Figure 3, with parts broken away.

Figure 5 is a view similar to Figure 8, but showing a modification.

Figure 6 is a sectional detail view showing the conical mouth of the liquid tube.

In these views, 1 indicates the cylinder of the'pump and 2 indicates the air tube which is threaded into the end of the cylinder so that it can be removed therefrom when desired. The cap 3 for the container 4: is fastened to the tube by solder or otherwise and also by the strap 5 which has its ends fastened to the cap and its central portion passing over the tube. Thus the cap and tube form a unit which can be separated from both the pump and the container. 7

The tube 2 has a horizontal slot 6 in its outer end which divides said outer end into an upper and lower part and the upper end of the liquid tube 7 passes through the lower 1927. 1 Serial 'No, 182,155.

part and projects into the space between: the two parts, this liquid tube also passing through the cap and extending into the container 4:,lasu st1al. I

Instead ofjforming the tube wit-h the slot 6 therein, said tube may be formed with the outer portion of its bore enlarged toform a cylindrical chamber 8, as shown in Figure 5, intowhich the liquid tube 7 projects, but in this case, the upper end of the tube must be extended at the rear to form a lip 9 to prevent the suction created by the return stroke of the piston of the pump from drawing liquid through the tube 7 and through the tube 2' into the pump cylinder. ,7 v This construction of the mouth of the air tube :acts toprevent the back stroke of the piston 0t the pump from drawing air back 7 over the mouth of the liquid tube, which would tend to draw liquid into the pump. The mouth, opening through the sides of the tube, permits more air to come in at the sides of the mouth than at the end thereof so/that the small amountof air coming in at, the end of the mouth and passing overthe liquid; tube is not sufficient to draw liquid through saidliquid tube.

In both cases, the air blastnisso concentrated or confined about the'endof the liquid tube that the spraying effect will be greatly increased without the expenditure of any more energy in operating the pump, as this confinement of the air'blastcreates a greater suction in theliquid tube and thus increases the spraying effect of the device; The in: creased blast also acts to divide the liquid into smalle-r particles and thus improves the spray. i c l form a perforation 10 in the cap 3 to permit air to enter the container and to permit the air to escape from the container when the air therein expands under the action of heat. If it were not for this perforation, the expanding air in the container would'force some of the liquid from the container through the tube 7 and this liquid running down the sides of the container, would soil the surface upon which the device is placed. The incorporation of the liquid tube with the air tube also makes a strong construction and prevents relative displacement of the parts, phich would injure or destroy the spray efect.

If the container should wear out, a new container can be substituted therefor, and this;

feature is an important one, as the pump is much more expensive than the container, and where the container is made fast to the pump, the entire device must be discarded when the container beginsto leak. As be:

, fore stated, this construction enables a container to be provided with a solid cap so that it can be marketed with its contents therein. The customer would then remove the solid cap and replace it by the cap 3.

Preferably, in all-the forms of the invention, I make the mouth of the liquid tube conical or flaring, as shown at 7 in Figure 6. This enables the air to act on the liquid as it leaves the tube and produces a better spray.

It is thought from the foregoing description that the advantages and novel features of my invention will be readily apparent.

I desire it to be understood that I may make changes in the construction and in the combination and arrangement of the several parts, provided that such changes fall within the scope or the appended claims;

What I claim is: V e V 1. In combination with a reciprocating air pump having a 'Valveless dischargeopening and a container, a Valveless air tube connected with said discharge opening, a liquid tube communicating with the container, said air tube having a mouth which confines the air blast and into which the liquid tube projects, saidmouth being formed by making the outer end or the bore of the tube enlarged, the liquid tube extending into the enlarged bore and havinga lip at its rear to prevent the suction created by the return stroke of the piston from drawing liquid from the tube into the pump.

2. In combination with a reciprocating air 45 pump having a valveless discharge opening and a container, a valveless air tube connected 7 with said discharge opening, a liquid tube communicating with the container and projecting intothe outer portion of the bore of 50 the air tube, the bore being of such crosssectional area as to confine the air blast close aboutthe end of the liquid tube, and means for preventing the suctioncreated by the return stroke of the piston from drawing liquid 55 through the liquid tube into the pump.

In testimony whereof I aifiX my signature.

ISAAC. W. P; BUCHANAN. 

